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<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>05.form_fields | KnockOut</title>
  <script src="../assets/knockout-3.5.1.js"></script>
</head>
<body>

  <p>目的地: <select data-bind="options: availableCountries"></select></p>

  <script type="text/javascript">
    var vm = {        
      availableCountries: ko.observableArray(['中国', '法国', '德国'])  
    };
    ko.applyBindings(vm);

    vm.availableCountries.push('美国');
  </script>

</body>
</html>